Plant and Soil

, Volume 292, Issue 1–2, pp 219–232 | Cite as

Root biomass and nutrient dynamics in a scrub-oak ecosystem under the influence of elevated atmospheric CO2

  • Alisha Lea Pagel Brown
  • Frank P. Day
  • Bruce A. Hungate
  • Bert G. Drake
  • C. Ross Hinkle
Regular Article

Abstract

Elevated CO2 can increase fine root biomass but responses of fine roots to exposure to increased CO2 over many years are infrequently reported. We investigated the effect of elevated CO2 on root biomass and N and P pools of a scrub-oak ecosystem on Merritt Island in Florida, USA, after 7 years of CO2 treatment. Roots were removed from 1-m deep soil cores in 10-cm increments, sorted into different categories (<0.25 mm, 0.25–1 mm, 1–2 mm, 2 mm to 1 cm, >1 cm, dead roots, and organic matter), weighed, and analyzed for N, P and C concentrations. With the exception of surface roots <0.25 mm diameter, there was no effect of elevated CO2 on root biomass. There was little effect on C, N, or P concentration or content with the exception of dead roots, and <0.25 mm and 1–2 mm diameter live roots at the surface. Thus, fine root mass and element content appear to be relatively insensitive to elevated CO2. In the top 10 cm of soil, biomass of roots with a diameter of <0.25 mm was depressed by elevated CO2. Elevated CO2 tended to decrease the mass and N content of dead roots compared to ambient CO2. A decreased N concentration of roots <0.25 mm and 1–2 mm in diameter under elevated CO2 may indicate reduced N supply in the elevated CO2 treatment. Our study indicated that elevated CO2 does not increase fine root biomass or the pool of C in fine roots. In fact, elevated CO2 tends to reduce biomass and C content of the most responsive root fraction (<0.25 mm roots), a finding that may have more general implications for understanding C input into the soil at higher atmospheric CO2 concentrations.

Keywords

Root biomass Carbon dioxide Carbon Phosphorus Nitrogen Scrub-oak 

References

  1. Bernston GM, Bazzaz FA (1996) The allometry of root production and loss in seedlings of Acer rubrum (Aceraceae) and Betula papyrifera (Betulaceae): implications for root dynamics in elevated CO2. Am J Bot 83:608–616CrossRefGoogle Scholar
  2. Canadell J, Lopez-Soria L (1998) Lignotuber reserves support regrowth following clipping of two Mediterranean shrubs. Funct Ecol 12:31–38CrossRefGoogle Scholar
  3. Canadell J, Lloret F, Lopezsoria L (1991) Resprouting vigor of 2 Mediterranean shrub species after experimental fire treatments. Vegetatio 95:119–126Google Scholar
  4. Canadell JG, Pitelka LF, Ingram JS I (1996) The effects of elevated (CO2) on plant-soil carbon below-ground: a summary and synthesis. Plant Soil 187:391–400CrossRefGoogle Scholar
  5. Chapin FS III, Bloom AJ, Field CB, Waring RH (1987) Plant responses to multiple environmental factors. Bioscience 37:49–57CrossRefGoogle Scholar
  6. Day FP, Stover DB, Pagel AL, Hungate BA, Dilustro JJ, Herbert BT, Drake BG, Hinkle CR (2006) Rapid root closure after fire limits fine root responses to elevated atmospheric CO2 in a scrub oak ecosystem in central Florida, USA. Glob Change Biol 12:1047–1053CrossRefGoogle Scholar
  7. Dijkstra P, Hymus G, Colavito D, Vieglais DA, Cundari CM, Johnson DP, Hungate BA, Hinkle CR, Drake DP (2002) Elevated atmospheric CO2 stimulates aboveground biomass in a fire-regenerated scrub-oak ecosystem. Glob Change Biol 8:90–103CrossRefGoogle Scholar
  8. Dilustro JJ, Day FP, Drake BG (2001) Effects of elevated atmospheric CO2 on root decomposition in a scrub oak ecosystem. Glob Change Biol 7:581–589CrossRefGoogle Scholar
  9. Dilustro JJ, Day FP, Drake BG, Hinkle CR (2002) Abundance, production and mortality of fine roots under elevated atmospheric CO2 in an oak-scrub ecosystem. Environ Exp Bot 48:149–159CrossRefGoogle Scholar
  10. Ferris R, Taylor G (1993) Contrasting effects of elevated CO2 on the root and shoot growth of four native herbs commonly found in chalk grasslands. New Phytol 125:855–866CrossRefGoogle Scholar
  11. Fitter AH (1987) An architectural approach to the comparative ecology of the plant root system. New Phytol 106:61–77CrossRefGoogle Scholar
  12. Gordon WS, Jackson RB (2000) Nutrient concentrations in fine roots. Ecology 81:275–280CrossRefGoogle Scholar
  13. Hall MC, Stiling P, Hungate BA, Drake BG, Hunter MD (2005) Effects of elevated CO2 and herbivore damage on litter quality in a scrub oak ecosystem. J Chem Ecol 31:2343–2356PubMedCrossRefGoogle Scholar
  14. Hall MC, Stiling P, Moon DC, Drake BG, Hunter MD (2006) Elevated CO2 increases the long-term decomposition rate of Quercus myrtifolia leaf litter. Glob Change Biol 12:568–577CrossRefGoogle Scholar
  15. Hungate BA, Reichstein M, Dijkstra P, Johnson D, Hymus G, Tenhunen JD, Hinkle CR, Drake BG (2002) Evapotranspiration and soil water content in a scrub oak woodland under carbon dioxide enrichment. Glob Change Biol 8:289–298CrossRefGoogle Scholar
  16. Hungate BA, Johnson DW, Dijkstra P, Hymus G, Stiling P, Megonigal JP, Pagel AL, Moan JL, Day FP, Li J, Hinkle CR, Drake BG (2006) Nitrogen cycling during seven years of atmospheric CO2 enrichment a scrub oak woodland. Ecology 87:26–40PubMedGoogle Scholar
  17. Ineson P, Cotrufo MF, Bol R, Harkness DD, Blum H (1996) Quantification of soil carbon inputs under elevated CO2: C3 plants in a C4 soil. Plant Soil 187:345–350CrossRefGoogle Scholar
  18. Jach ME, Laureysens I, Ceulemans R (2000) Above- and below-ground production of young scots pine (Pinus sylvestris L.) trees after three years of growth in the field under elevated CO2. Ann Bot 85:789–798CrossRefGoogle Scholar
  19. Janssens IA, Crookshanks M, Taylor G, Ceulemans R (1998) Elevated atmospheric CO2 increases fine root production, respiration, rhizosphere respiration and soil CO2 effluz in Scotts pine seedlings. Glob Change Biol 4:871–878CrossRefGoogle Scholar
  20. Janzen HH, Entz T, Ellert BH (2002) Correction mathematically for soil adhering to root samples. Soil Biol Biochem 34:1965–1968CrossRefGoogle Scholar
  21. Johnson DW, Hungate BA, Dijkstra P, Hymus G, Hinkle CR, Stiling P, Drake BG (2003) The effects of elevated CO2 on nutrient distribution in a fire-adapted scrub oak forest. Ecol Appl 13:1388–1399Google Scholar
  22. Jongen M, Jones MB, Hebeisen T, Blum H, Hendrey GR (1995) The effects of CO2 concentrations on the root growth of Lolium perenne and Trifolium repens grown in a FACE system. Glob Change Biol 1:361–371CrossRefGoogle Scholar
  23. King JS, Pregitzer KS, Zak DR, Sober J, Isebrands JG, Dickson RE, Hendrey GR, Karnosky DF (2001) Fine-root biomass and fluxes of soil carbon in young stands of paper birch and trembling aspen as affected by elevated atmospheric CO2 and tropospheric O3. Oecologia 128:237–250CrossRefGoogle Scholar
  24. Körner C, Arnone JA III (1992) Responses to elevated carbon dioxide in artificial tropical ecosystems. Science 257:1672–1675CrossRefPubMedGoogle Scholar
  25. Langley JA, Dijikstra P, Drake BG, Hungate BA (2003) Ectomycorrhizal colonization, biomass and production in a regenerating scrub oak forest in response to elevated CO2. Ecosystems 6:424–430Google Scholar
  26. Li J, Dijkstra P, Hinkle CR, Wheeler RM, Drake BG (1999) Photosynthetic acclimation to elevated atmospheric CO2 concentration in the Florida scrub-oak species Quercus geminata and Quercus myrtifolia growing in their native environment. Tree Physiol 19:229–234PubMedGoogle Scholar
  27. Lipson DA, Wilson RF, Oechel WC (2005) Effects of elevated atmospheric CO2 on soil microbial biomass, activity, and diversity in a chaparral ecosystem. Appl Environ Microbiol 71:8573–8580PubMedCrossRefGoogle Scholar
  28. Matamala R, Schlesinger WH (2000) Effects of elevated atmospheric CO2 on fine root production and activity in an intact temperate forest ecosystem. Glob Change Biol 6:967–979CrossRefGoogle Scholar
  29. McGuire AD, Melillo JM, Joyce LA (1995) The role of nitrogen in the response of forest net primary production to elevated atmospheric carbon dioxide. Annu Rev Ecol Syst 26:473–503CrossRefGoogle Scholar
  30. Melillo JM, Aber JD, Muratore JF (1982) Nitrogen and lignin control of hardwood leaf litter decomposition dynamics. Ecology 63:621–626CrossRefGoogle Scholar
  31. Norby RJ, O’Niell EG, Hood WG, Luxmoore RJ (1987) Carbon allocation, root exudation and mycorrhizal colonization of Pinus echinata seedlings grown under elevated CO2 enrichment. Tree Physiol 3:203–210PubMedGoogle Scholar
  32. Norby RJ, Gunderson CA, Wullschleger SD, O’Neill EG, McCracken MK (1992) Productivity and compensatory responses of yellow-poplar trees in elevated CO2. Nature 357:322–324CrossRefGoogle Scholar
  33. O’Neill EG (1994) Responses of soil biota to elevated atmospheric carbon dioxide. Plant Soil 165:55–65CrossRefGoogle Scholar
  34. Pregitzer KS, Zak DR, Maziasz J, DeForest JL, Curtis PS, Lussenhop J (2000) Interactive effects of atmospheric CO2 and soil-N availability in fine roots of Populus tremuloides. Ecol Appl 10:18–33CrossRefGoogle Scholar
  35. Prentice IC, Farquar GD, Fasham MJR, Goulden ML, Heimann M, Jaramillo VJ, Kheshgi HS, Le Quéré C, Scholes RJ, Wallace DWR (2001) The carbon cycle and atmospheric carbon dioxide. Contributions of working group I to the third assessment report of the Intergovernmental Panel on Climate Change. In: Houghton JT et al (ed) IPCC climate change 2001: the scientific basis. Cambridge University Press, New York, pp 183–237Google Scholar
  36. Rogers HH, Runion GB, Krupa SV (1994) Plant responses to atmospheric CO2 with emphasis on roots and the rhizosphere. Environ Pollut 83:155–189PubMedCrossRefGoogle Scholar
  37. Sabine C, Freely RA, Gruber N, Key RM, Lee K, Bullister JL, Wanninkhof R, Wong CS, Wallace DWR, Tilbrook B, Millero FJ, Peng T-H, Kozyr A, Ono T, Rios AF (2004) The oceanic sink for anthropogenic CO2. Science 305:367–371PubMedCrossRefGoogle Scholar
  38. Schmalzer PA, Hinkle CR (1990) Geology, geohydrology and soils of Kennedy Space Center: a review. NASA Technical Memorandum 103813, NASA, Kennedy Space Center, FloridaGoogle Scholar
  39. Schmalzer PA, Hinkle CR (1991) Dynamics of vegetation and soils of oak/saw palmetto scrub after fire: observations from permanent transects. NASA Technical Memorandum 103817, NASA, Kennedy Space Center, FloridaGoogle Scholar
  40. Taiz L, Zeiger E (1998) Mineral nutrition in plant physiology. In: Taiz L, Zeiger E (eds) Plant physiology. Sinauer Associates, Inc. Publishers, Sunderland, Massachusetts, pp 103–114Google Scholar
  41. Van Ginkel JH, Gorissen A, Van Veen JA (1996) Long-term decomposition of grass roots as affected by elevated atmospheric carbon dioxide. J Environ Qual 25:1122–1128CrossRefGoogle Scholar
  42. Waisel Y, Eshel A, Kafkafi U (2002) Plant roots: the hidden half. Marcel Dekker, Inc, New YorkGoogle Scholar
  43. Wiemken V, Laczko E, Ineichen K, Boller T (2001) Effects of elevated carbon dioxide and nitrogen fertilization on mycorrhizal fine roots and the soil microbial community in beech-spruce ecosystems on siliceous and calcareous soil. Microb Ecol 42:126–135PubMedGoogle Scholar
  44. Williams RS, Lincoln DE, Thomas RB (1994) Loblolly pine grown under elevated CO2 affects early instar pine sawfly performance. Oecologia 98:64–71CrossRefGoogle Scholar
  45. Zak DR, Pregitzer KS, Curtis PS, Teeri JA, Fogel R, Randlett DL (1993) Elevated atmospheric CO2 and feedback between carbon and nitrogen cycles. Plant Soil 151:105–117CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  • Alisha Lea Pagel Brown
    • 1
    • 5
  • Frank P. Day
    • 1
  • Bruce A. Hungate
    • 2
  • Bert G. Drake
    • 3
  • C. Ross Hinkle
    • 4
  1. 1.Department of Biological SciencesOld Dominion UniversityNorfolkUSA
  2. 2.Department of Biological Sciences and Merriam-Powell Center for Environmental ResearchNorthern Arizona UniversityFlagstaffUSA
  3. 3.Smithsonian Environmental Research CenterEdgewaterUSA
  4. 4.Dynamac CorporationKennedy Space CenterUSA
  5. 5.MarinaUSA

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